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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
The City of Moreno Valley is located in a semi-arid region of western Riverside County just east of the San Bernardino Mountains and south of the San Gabriel Mountains. The average annual high temperature is 76 degrees with an average low of 49 degrees.